Core barrel



i Patented lVlay 29, 1928.

PATENT oFFlcE..

, EDWARD E. RAYMOND, 'oEfsANTA EE'sPRINef's, CADIEORNIA, AssreN'oR 'ro REED AND WILLIAMS ENGINEERING COMPANY, 0E Los ANGELEs, cALIEoRNIA, A CORPORA- TIQN OF CALIFORNIA.

coRE BARREL.

Application iled March 1 7, 1924,Seria1 No. 699,783. Renewed SeptemberaZ, 1925.

i My invention pertains to a core barrel adapted to drill and preservev a core to show .the formation of geological strata through Which-'the tool travels. The objects are to provide a core barrel lWhich maybe easily and quickly dis-assembled to allow the core to be removed intact; to make such a core barrel that may be reasonably cheap to manufacture; durable, and With a minimum of danger of the same being lost in the' hole.

I attain these objects among others by 'the provision, construction and assembling -of the various members and parts shown in the accompanying drawings, in which Figure 1 is a view of the essential4 parts of the co1'e barr el. in'appositi'on `for rigid assembling.

Figure 2 is a View 'of the lower or drilling end of the core barrel, looking in. the direction of arrow A. Y

Figure 3 is a View of the core bit, in sep-A arable halvesL Figure 4 is a cross-sectionalv view of one half of th`e core barrel, showing in particular the relation of drilling bits and core bit, and

a spiralrifling of the core bit.

1 have designed this core barrel and describe and illustrate it herein as used by me in oil well drilling, although it is 'equallyapplicable oin all instances-where a core for geological study is called for.

I have sought by my method of construction to avoid friction of the core as it passes upward into the lcore barrel. This I 'accomplish by providing a degree of lubrication Within the core bit b means of'spiral grooves inthe inner sur ace thereof; anq also by having "the bore of the core barre slightly greater in diameter than that ofthe core bit proper.

'- yAnother 'valuable feature of my tool is Y-found inthe fact that l have designed the points of the drill bits to project slightly below the tips of the core bit teeth, in order that said drill bits may make the first advance into the virginV formation, while having their projecting cutting ends .taper inwardly and upwardly to the outer surface of the-core bit so that the formation immediately surrounding the core bitimay 'not be chewed or disturbed in any manner by any part of .the tool except vthe .core bit itself, thus tending to insure a perfect core.

1 indicates a cylindrical core barrel, divided longitudinally into practically identical halves, 1a1", and provided with a driving head anda drilling head of diameters larger thanl that of the long shaft of the cylinderor'barrel.

2 indicates the beveled and threaded driving end of the barrel adapted to receive a driving head 12.

3 3 lindicate interlocking longitudinal projections and corresponding recesses in halves 11-1, adapted to laccurately align said halves. 2

4 ,indicates a beveled and of' barrel 1 adapted to receive internally threaded sleeve 8. v

5W-'5 indicate recesses in the body of halves 1& 1b4 adapted v,to form housings forbolts 9 -9. i

-6-6 indicate an annular groove in the upper shoulder 4of thedriving head 1c of barrel 1, adapted to correspond with a similar groove in the lower abutting end of drive-head 1 2 t'o afford free circulation for `fluids in the well should holes 7-7 in said v1"*1b and head 12, adapted -to provide circulation for fluids in the well las the drill advances 8 indicates a sleeve/ surroundlng barrel 1,

removable over the driving end of Athe same, and provided with internal beveled thread 8a to receive beveled 'thread 9- 9 indicate removable bolts adapted to hold halves la-lb'in exact apposition.

- 10-10 indicate drill bits set in corresponding key sockets in the drilling head of halves 1-1".

10-i1()El indicate the .points 10-10. 1

11-11 Iindicate'a4 core drill or shoe, providedv with the usual cutting for drilling teeth, lugs 11a adapted to enter corresponding lrecesses on the inner surfaces of vthe drill-head of barrel, and provided further with spiral of drill bits grooves on the inner surface thereof, 13--13.

12 indicates a driving head adapted to screw onto beveled thread 2 o f barrel 1 by threaded section i v means ofinternal beveled thread 12a; provided with outside thread 12b for attachment by means of thread 12b.

are then driven into corresponding sockets of a drill shaft; provided also'with perforations, 7 7, therethrough for 1circulation of fluid, and with a cylindrical end, 12., of smaller diameter'adapted to contain a ball valve, 12b, of the ordinary type. f

lll- K14 indicate corresponding and opposing key sockets in halves la'-1b, adapted to receive corresponding lkeys to hold said barrel halves ,in fixed apposition. c

Assembling of the core barrel comprises: core bits 11-11 are kplaced within halves Ia- 1", lugs 11e-,1la serving for lcorrectl placement and to prevent core bit 11 from turning in the barrel 1; halves 1**--1b are brought together; bolts 9-*9 are placed and tightened; sleeve 8 is passed'over the driving end of barrel l and screwed downl tightly against the projecting shoulder at the base of thread 4; keys corresponding to key-sockets 14s- 14 are driven in; driving head 12 is screwed onto thread 2 and attached to a driving shaft Drill bits 10-10 in the drill-end Aof barrel l, the upper end of the said bits being prevented from passing upward by sleeve 8.

The tool is then ready for entering Ithe hole and proceeding to drill and cut a cole.V

It is important to note that drill points 101-10a of drill bits 10-10 project downward slightly beyond ,the points of the teeth of core bit 11, and are therefore the first to enter the earth formation. And to note further, that the cutting edges of bits 10-10 taper inwardly at an angle ofapproximately 45% to core bit 1l, with the result that core bit 11 will advancesome distance into `new and solid formation before said drill bits 10-10 have disturbed the formation imme-- diately surrounding the core bit 11.

As the tool advances into the earth forma? tion, circulation of the Water and dbris with. in the hole must be maintained after the advancement of the tool has closed circulation both within and without, the core barrel. Therefore I have provided multiplefperfora.-

tions 7 7 which allow the fluid to pass-up- Y is reversed'to free the core.

`diameters as need requires.

ward to the comparatively open hole above the tool.

After the barrel has advanced the desired distance into the earth formation, that is, when 4the core barrel has advanced its full length, the tool is removed from the hole and the process of assembling above set forth then be found in one continuous piece, showing the exact strata lthrough which the barrel has advanced. In actual use in oil fields the core barrel is made of varying lengths and Advancement of the core through 13-13 on the inner surface thereof. It will The core will core bit ill 1s made easierbecause of splral groove .I

be noted that the diameter of*l the core bore in the barrel 1 is slightly greater thanthat of the core -bit 11. The body `1 forms a core retainer tube and a drill shank for vthe cutters. A threaded pin 2 is vprovided for atltachment to the drill pipe or string. This structure is simple, strong, and `easily manipulated in taking and capturing cores' and A, in their removal from the barrel for examination.

Having thus .described the. construction and operation of myinvention asv applied in one field of industry, I claimas -new and desire to obtain LettersPatert of the United States upon:

l. A core barrel of the character disclosed comprising separable halves and means for locking said halves in rigid apposition; a A

drive head adapted to screwonto-the driving head of said `barrel by means of beveled threaded section therein; 'the drill-head of said barrel being provided with la counterbore adapted to receive a core bit, and multiple key sockets inthe periphery thereof adaptefl to receive drill bits; said drill bits being `apered from drill point inward and upward andabutting upon said core bit; the

circumferentially larger than said barrel' shaft; al section of said barrel having 'an vupwardly tapered thread adapted to receive a removable sleeve provided with a corresponding internal tapered thread; saidenlarged drill end being provided with a counterbore in the endthereof adapted to 'receive a core bit; said drill end. being further provided' with multiple key sockets longitudinally cut in the periphery thereof and adapted to' receive multiple drill' bits; multiple drill bits adapted to fit |tightly into said key-sockets and formed to project beyond the periphery of \said drill'head to serve as reamers; said drill bits being tapered upward and inward from the external points thereof and abutting against said Ycore bit; and a core bit`y having an internal diameter slightly smaller than the bore of said barrel, and being pro` videdwith a spiral groove on the inner surface thereof. y Y

3. A core barrel of the character disclosed comprising separable longitudinal halves and means for rigidly holding said halves with a tapered receive a driving shaft; Y

to form a cylindrical barrelrthe driving end annular groove in the upper shoulder of said enlarged driving end; perforations opening into'said groove and passing longitudinally through said barrel; said barrel being provided with a threaded tapered section immediately above the enlarged drilling end; a removable sleeve adapted to screw onto said threaded section and abut against the upper shoulder formed by said enlarged barrel end; said drilling end being provided with corresponding longitudinal key-sockets in said halves, adapted to receive correspondin'g keys to hold said halves rigidly in apposition.

4. A rotary core barrel tool of the character described comprising an outer shell extending substantially the full length of the core receiving bore and forming a core retainer, said shell being divided longitudinally throughout the length of said bore into a plurality of sections whereby it may be opeled to expose land release an entire core, cutters at the bottom of said tool and means to lock the sections of said shell in rigid apposition. 1

' 5. A rotary core barrel tool of the character described comprisin a shell extending 'substantially the full ength of the vcore l ter described comprisingl a shell extending substantially the full length. of the core receiving bore of the tool forming a core retainer and having a .coupling member at the top for securing it to a drill string whereby it may be rotated, cutters at the bottom of said shell, the latter serving as a shank for said cutters, said shell being split longitudinally the full length of the core receiving bore whereby it may be opened to expose and release an entire core, and means to lock the section-s of said shell in rigid apposition.

7. A rotary core barrel tool of the character described com rising a shell extending substantially the ull length of the core receiving bore of the tool forming a core retainer and having a couplingmember at the top for securing it toa drill string whereby it may be rotated, cutters at the bottom of said shell, the shell serving as a shank for said cutters, said shell being split longitudinally the full lengtlof the core receiving bore whereby itv may be opened to expose and release an entire core, and va tubular lock memberI for encompassing said shell and locking the Sections thereof in rigid apposition.

8. A rota core barrel tool of the character describe comprising al shell extending substantially the full length of the core receiving bore of the tool forming a core retainer and having a coupling member at the top for securing it to a Ldrill string whereof said shell, the shellvser'ving as a shank for said cutters, said shell being split longitudinally the lfull length of the core receivit may be rotated, cutters at the bottom ing bore whereby. it may be opened to exf pose and release an entire core, and a lock collar removably screwed on said shell for holding the sections thereof assembled.

In testimony whereof, I have signed my name to this applicatlon and power of attorney.

ED. RAYMOND. 

